Detection system and inkjet recording apparatus

Abstract

A detection system includes a detection target device, a detection device, and a control part. The detection target device is provided with a first rotating member rotating around a first shaft. The detection device is provided with a second rotating member rotating around a second shaft by a driving force transmitted from the first rotating member through a gear train, and its output value monotonically increases or decreases according to a rotation angle of the second rotating member. The control part calculates a driving amount of the first rotating member for correcting an output value of the detection device from a phase shift of an output value of the detection device when a rotation direction of the first rotating member is changed.

1 . A detection system comprising:
 a detection target device which is provided with a first rotating member rotating around a first shaft;   a detection device which is provided with a second rotating member rotating around a second shaft by a driving force transmitted from the first rotating member through a gear train, and whose output value monotonically increases or decreases according to a rotation angle of the second rotating member; and   a control part which calculates a driving amount of the first rotating member for correcting an output value of the detection device from a phase shift of an output value of the detection device when a rotation direction of the first rotating member is changed.   
     
     
         2 . The detection system according to  claim 1 , wherein,
 the control part calculates the driving amount of the first rotating member for correcting an output value of the detection device from a phase shift of an output value of the detection device when a rotation direction of the first rotating member is changed and a proportional relationship between a driving amount of the first rotating member and an output value of the detection device.   
     
     
         3 . The detection system according to  claim 1 , wherein,
 the first rotating member has an intersecting surface intersecting the first shaft;   the detection target device includes:   a stepped part which is provided on the intersecting surface and whose height is changed in a stepped manner in a circumferential direction;   an adjustment member which faces the intersecting surface and is movable in a direction of the first shaft;   balls disposed between the adjustment member and the intersecting surface and restricted in movement in the circumferential direction, or projections projecting from the adjustment member and in contact with the intersecting surface, and   the stepped parts having the same pattern are provided at N positions (N is an integer greater than or equal to 2) in the circumferential direction on the intersecting surface,   one ball or one projection is arranged in each of the stepped parts at N positions, and   the balls or the projections are in contact with steps of the same height of the stepped parts at N positions.   
     
     
         4 . The detection system according to  claim 1 , wherein,
 the detection object device repeats an operation corresponding to a rotation angle of the first rotating member every time the first rotating member rotates by 1/N, and   an output value of the detection device repeats monotonic increase or monotonic decrease in accordance with a rotation angle of the second rotating member every time the second rotating member rotates once.   
     
     
         5 . The detection system according to  claim 1 , wherein,
 the detection device is a potentiometer.   
     
     
         6 . The detection system according to  claim 1 , wherein,
 the first rotating member and the second rotating member are gears.   
     
     
         7 . An inkjet recording apparatus comprising:
 a head unit which includes one or more inkjet heads and is in contact with the adjustment member, and   the detection system according to  claim 3 , wherein   the control part controls the detection target device according to an operating amount of the detection target device detected by the detection system.